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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Mar. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities $ 1,372 $ 736
Equity investments 3,471 4,084
Investments in marketable securities total 4,843 4,820
Foreign government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 31  
U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 430 211
Municipal debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 11 10
Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 663 187
U.S. government agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 28 32
Non-agency residential mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 13 1
Non-agency commercial mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 73 47
Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 80 52
Recurring [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 1,372 736
Equity investments 3,471 4,084
Investments in marketable securities total 4,843 4,820
Derivative assets 54 54
Counterparty netting and collateral (1,335) (1,302)
Assets at fair value 4,897 4,874
Counterparty netting and collateral 1,146 1,384
Liabilities at fair value (16) (1)
Net assets at fair value 4,881 4,873
Recurring [Member] | Commercial paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 43 196
Recurring [Member] | Foreign government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 31  
Recurring [Member] | U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 430 211
Recurring [Member] | Municipal debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 11 10
Recurring [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 663 187
Recurring [Member] | U.S. government agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 28 32
Recurring [Member] | Non-agency residential mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 13 1
Recurring [Member] | Non-agency commercial mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 73 47
Recurring [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 80 52
Recurring [Member] | Fixed income total return bond funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 1,415 2,429
Recurring [Member] | Equity mutual funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 945 883
Recurring [Member] | Counterparty Netting & Collateral [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Equity investments 0 0
Investments in marketable securities total 0 0
Derivative assets (1,335) (1,302)
Counterparty netting and collateral (1,335) (1,302)
Assets at fair value (1,335) (1,302)
Counterparty netting and collateral 1,146 1,384
Liabilities at fair value 1,146 1,384
Net assets at fair value (189) 82
Recurring [Member] | Counterparty Netting & Collateral [Member] | Commercial paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Foreign government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0  
Recurring [Member] | Counterparty Netting & Collateral [Member] | U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Municipal debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | U.S. government agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Non-agency residential mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Non-agency commercial mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Fixed income total return bond funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 0 0
Recurring [Member] | Counterparty Netting & Collateral [Member] | Equity mutual funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 0 0
Recurring [Member] | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 348 330
Derivative liabilities (282) (243)
Recurring [Member] | Foreign currency swaps [Member] | Counterparty Netting & Collateral [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring [Member] | Interest rate swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 1,041 1,026
Derivative liabilities (880) (1,142)
Recurring [Member] | Interest rate swaps [Member] | Counterparty Netting & Collateral [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring [Member] | Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 419 229
Equity investments 2,360 3,312
Investments in marketable securities total 2,779 3,541
Derivative assets 0 0
Counterparty netting and collateral 0 0
Assets at fair value 2,779 3,541
Counterparty netting and collateral 0 0
Liabilities at fair value 0 0
Net assets at fair value 2,779 3,541
Recurring [Member] | Level 1 [Member] | Commercial paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 20
Recurring [Member] | Level 1 [Member] | Foreign government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0  
Recurring [Member] | Level 1 [Member] | U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 419 209
Recurring [Member] | Level 1 [Member] | Municipal debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 1 [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 1 [Member] | U.S. government agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 1 [Member] | Non-agency residential mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 1 [Member] | Non-agency commercial mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 1 [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 1 [Member] | Fixed income total return bond funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 1,415 2,429
Recurring [Member] | Level 1 [Member] | Equity mutual funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 945 883
Recurring [Member] | Level 1 [Member] | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring [Member] | Level 1 [Member] | Interest rate swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring [Member] | Level 2 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 926 431
Equity investments 0 0
Investments in marketable securities total 926 431
Derivative assets 1,389 1,356
Counterparty netting and collateral 0 0
Assets at fair value 2,315 1,787
Counterparty netting and collateral 0 0
Liabilities at fair value (1,162) (1,385)
Net assets at fair value 1,153 402
Recurring [Member] | Level 2 [Member] | Commercial paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 43 176
Recurring [Member] | Level 2 [Member] | Foreign government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 31  
Recurring [Member] | Level 2 [Member] | U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 11 2
Recurring [Member] | Level 2 [Member] | Municipal debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 8 10
Recurring [Member] | Level 2 [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 663 187
Recurring [Member] | Level 2 [Member] | U.S. government agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 28 32
Recurring [Member] | Level 2 [Member] | Non-agency residential mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 9 0
Recurring [Member] | Level 2 [Member] | Non-agency commercial mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 70 5
Recurring [Member] | Level 2 [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 63 19
Recurring [Member] | Level 2 [Member] | Fixed income total return bond funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 0 0
Recurring [Member] | Level 2 [Member] | Equity mutual funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 0 0
Recurring [Member] | Level 2 [Member] | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 348 330
Derivative liabilities (282) (243)
Recurring [Member] | Level 2 [Member] | Interest rate swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 1,041 1,026
Derivative liabilities (880) (1,142)
Recurring [Member] | Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 27 76
Equity investments 0 0
Investments in marketable securities total 27 76
Derivative assets 0 0
Counterparty netting and collateral 0 0
Assets at fair value 27 76
Counterparty netting and collateral 0 0
Liabilities at fair value 0 0
Net assets at fair value 27 76
Recurring [Member] | Level 3 [Member] | Commercial paper [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 3 [Member] | Foreign government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0  
Recurring [Member] | Level 3 [Member] | U.S. government and agency obligations [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 3 [Member] | Municipal debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 3 0
Recurring [Member] | Level 3 [Member] | Corporate debt securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 3 [Member] | U.S. government agency mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 0 0
Recurring [Member] | Level 3 [Member] | Non-agency residential mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 4 1
Recurring [Member] | Level 3 [Member] | Non-agency commercial mortgage-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 3 42
Recurring [Member] | Level 3 [Member] | Asset-backed securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Available-for-sale securities, Debt securities 17 33
Recurring [Member] | Level 3 [Member] | Fixed income total return bond funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 0 0
Recurring [Member] | Level 3 [Member] | Equity mutual funds [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 0 0
Recurring [Member] | Level 3 [Member] | Foreign currency swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring [Member] | Level 3 [Member] | Interest rate swaps [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Derivative assets 0 0
Derivative liabilities 0 0
Recurring [Member] | Fixed income mutual funds measured at net asset value [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments 1,111 772
Recurring [Member] | Fixed income mutual funds measured at net asset value [Member] | Counterparty Netting & Collateral [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Equity investments $ 0 $ 0